CVE-2026-62735
Windows HTTP.sys Elevation of Privilege Vulnerability
CVE-2026-62735 is fixed in 30 products on 1 platform, first by KB5120418, released August 11, 2026. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.
Urgent
CVSS
7.8
Important
Exploitation
More likely
Vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0087
58th percentile
<p>Heap-based buffer overflow in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.</p>
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Microsoft | |||
| Windows 10 Version 1607 for 32-bit Systems | 14393.9418 | KB5120418 | Aug 11, 2026 |
| Windows 10 Version 1607 for x64-based Systems | 14393.9418 | KB5120418 | Aug 11, 2026 |
| Windows 10 Version 1809 for 32-bit Systems | 17763.9121 | KB5120238 | Aug 11, 2026 |
| Windows 10 Version 1809 for x64-based Systems | 17763.9121 | KB5120238 | Aug 11, 2026 |
| Windows 10 Version 21H2 for 32-bit Systems | KB5120249 | Aug 11, 2026 | |
| Windows 10 Version 21H2 for ARM64-based Systems | KB5120249 | Aug 11, 2026 | |
| Windows 10 Version 21H2 for x64-based Systems | KB5120249 | Aug 11, 2026 | |
| Windows 10 Version 22H2 for 32-bit Systems | KB5120249 | Aug 11, 2026 | |
| Windows 10 Version 22H2 for ARM64-based Systems | KB5120249 | Aug 11, 2026 | |
| Windows 10 Version 22H2 for x64-based Systems | KB5120249 | Aug 11, 2026 | |
| Windows 11 Version 23H2 for ARM64-based Systems | 22631.7517 | KB5120240 | Aug 11, 2026 |
| Windows 11 Version 23H2 for x64-based Systems | 22631.7517 | KB5120240 | Aug 11, 2026 |
| Windows 11 Version 24H2 for ARM64-based Systems | KB5121003 | Aug 11, 2026 | |
| Windows 11 Version 24H2 for ARM64-based Systems | KB5120994 | Aug 11, 2026 | |
| Windows 11 Version 24H2 for x64-based Systems | KB5121003 | Aug 11, 2026 | |
| Windows 11 Version 24H2 for x64-based Systems | KB5120994 | Aug 11, 2026 | |
| Windows 11 Version 25H2 for ARM64-based Systems | KB5121003 | Aug 11, 2026 | |
| Windows 11 Version 25H2 for ARM64-based Systems | KB5120994 | Aug 11, 2026 | |
| Windows 11 Version 25H2 for x64-based Systems | KB5121003 | Aug 11, 2026 | |
| Windows 11 Version 25H2 for x64-based Systems | KB5120994 | Aug 11, 2026 | |
| Windows 11 Version 26H1 for ARM64-based Systems | 28000.2704 | KB5121000 | Aug 11, 2026 |
| Windows 11 version 26H1 for x64-based Systems | 28000.2704 | KB5121000 | Aug 11, 2026 |
| Windows Server 2012 | KB5120386 | Aug 11, 2026 | |
| Windows Server 2012 (Server Core installation) | KB5120386 | Aug 11, 2026 | |
| Windows Server 2012 R2 | KB5120385 | Aug 11, 2026 | |
| Windows Server 2012 R2 (Server Core installation) | KB5120385 | Aug 11, 2026 | |
| Windows Server 2016 | 14393.9418 | KB5120418 | Aug 11, 2026 |
| Windows Server 2016 (Server Core installation) | 14393.9418 | KB5120418 | Aug 11, 2026 |
| Windows Server 2019 | 17763.9121 | KB5120238 | Aug 11, 2026 |
| Windows Server 2019 (Server Core installation) | 17763.9121 | KB5120238 | Aug 11, 2026 |
| Windows Server 2022 | 20348.5440 | KB5120229 | Aug 11, 2026 |
| Windows Server 2022 | 20348.5499 | KB5120242 | Aug 11, 2026 |
| Windows Server 2022 (Server Core installation) | 20348.5440 | KB5120229 | Aug 11, 2026 |
| Windows Server 2022 (Server Core installation) | 20348.5499 | KB5120242 | Aug 11, 2026 |
| Windows Server 2025 | 26100.33222 | KB5120228 | Aug 11, 2026 |
| Windows Server 2025 | 26100.33296 | KB5120233 | Aug 11, 2026 |
| Windows Server 2025 (Server Core installation) | 26100.33222 | KB5120228 | Aug 11, 2026 |
| Windows Server 2025 (Server Core installation) | 26100.33296 | KB5120233 | Aug 11, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.